Iku versus Okonau

I am rather annoyed with this character. What character is it?
This one.

行
It has a double meaning.

I hate double meanings.

行く, iku, is a word I am familiar with; it means "to go"

行う, okonau, is a word... but wait... THE SAME KANJI ??? That's retarded.
okonau is the verb "to do".

I have them straightened, so there's no confusion... but I am still learning more complicated verb conjugations, and how and I supposed to know which is which in a real context ???

That's my annoyance of the day.

彼 は 読み書き が できる。
kare wa yomi+kaki ga dekiru.
He can read and write.

And that's the word for today - できる/dekiru - to be able (to).